Scheme 4
Scheme 5
Principles of Operation
After the engine is started, voltage is applied through the warning indicator I circuit 904 (LG/RD) from the powertrain control module (PCM) to the voltage regulator. This turns the regulator on, allowing current to flow from the battery sensing A circuit 35 (OG/LB) to the generator field coil. At this time, the generator begins to generate current which is then supplied to the vehicle's electrical system through the output (B+) terminal of the generator.
With the system functioning normally, the generator output current is determined by the voltage of the A circuit 35 (OG/LB). The A circuit 35 (OG/LB) voltage is compared to a set voltage internal to the regulator, and the regulator controls the generator field current to maintain the correct generator output.
The set voltage will vary with temperature and is typically higher in cold temperatures and lower in warm temperatures. This allows for better battery recharge in the winter and reduces the chance of overcharging in the summer.
Refer to POWER DISTRIBUTION (Explorer) or POWER DISTRIBUTION Wiring Diagrams for schematic and connector information.
Scheme 6
Scheme 7
Normal Operation
The generator output is supplied through the battery positive output (B+) terminal on the back of the generator to the battery and electrical system. During normal operation the charging system warning indicator should be off with the ignition switch in the ON position and the engine running. The charging system warning indicator should be on with the ignition switch in the ON position and the engine off.
With the engine running, the charging system warning indicator should be off. The sense A circuit 35 (OG/LB) to the generator field coil is 13-15 volts. The S (stator) circuit (internal to the generator) is used to feed back a voltage signal from the generator to the voltage regulator. This voltage is used by the voltage regulator to turn off the charging system warning indicator. The I (ignition) circuit 904 (LG/RD) is used to turn on the voltage regulator. This circuit will be 0 volts with the ignition switch in the ON position and the engine not running. Once the engine is started, the I circuit will measure 8-10 volts (C102a connected). The battery positive output (B+) circuit 38 (BK/OG) is the generator output supplied to the battery and electrical system.
The generator output is determined by the voltage of the A circuit 35 (OG/LB). The A circuit voltage is compared to a set voltage internal to the regulator and the regulator controls the generator field current o maintain the correct generator output. The set voltage will vary with temperature and is typically higher in cold temperatures and lower in warm temperatures.
With the engine running, the charging system warning indicator should be off. The sense A circuit 35 (OG/LB) to the generator field coil is 13-15 volts. The S (stator) circuit (internal to the generator) is used to feed back a voltage signal from the generator to the voltage regulator. This voltage is used by the voltage regulator to turn off the charging system warning indicator. The I (ignition) circuit 904 (LG/RD) is used to turn on the voltage regulator. This circuit will be 0 volts with the ignition switch in the ON position (C102a disconnected) and the engine not running. The battery positive output (B+) circuit 38 (BK/OG) is the generator output supplied to the battery and electrical system.
Under normal operation, the I (ignition) circuit 904 (LG/RD) will be 0 volts with the ignition switch in the ON position (C102a connected) and the engine not running. This will turn the charging system warning indicator on. This circuit is also used to turn the charging system warning indicator on if there is a fault in the charging system.
With the engine running, the charging system warning indicator should be off. The sense A circuit 5 (OG/LB) to the generator field coil is 13-15 volts. The S (stator) circuit (internal to the generator) is used to feed back a voltage signal from the generator to the voltage regulator. This voltage is used by the voltage regulator to turn off the charging system warning indicator. The I ignition) circuit 904 (LG/RD) is used to turn on the voltage regulator. This circuit will be 0 volts C102a connected) with the ignition switch in the ON position and the engine not running. The battery positive output (B+) circuit 38 (BK/OG) is the generator output supplied to the battery and electrical system.
The generator is belt-driven by the engine accessory drive system.
The generator radio suppression equipment reduces interference transmitted through the radio speakers by the vehicle electrical system.
Battery condition is determined by measuring battery terminal voltage after a specific discharge current is applied for a specified time period.